èFor any specialized knowledge, 10,000hours is fundamental;
After 30,000hours, there is an opportunity for him to form his own wisdom;
After 50,000 hours, than one can fully master the subject and create. In olden day of China, the student must study
for 30,000hours as fundamental before he went for state exam – which took ten
years.

èAs Mozart became famous at the age of 22… He had practice piano 16 hours a day for 12
years. So, he got famous after practice
70,000 hours.

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This is tally with the books – Talent is Overrated, and The
Talent Code.

I once read in a book in the library that Jesse Livermore,
Richard D. Wyckoff, and W.D. Gann had spent around 10 years in their research before they mastered their skill.